package base;
import jm.audio.Instrument;
import jm.audio.io.SampleOut;
import jm.audio.synth.*;

/**
 * A sawtooth waveform instrument implementation
 * which includes low and high pass filters act in series to
 * form a band pass filter.
 *
 * @author Andrew Brown
 */

public final class BandPassFilterInst extends Instrument {
    //----------------------------------------------
    // Attributes
    //----------------------------------------------
    private int sampleRate;
    private int filterCutoff;
    private int channels;

    //----------------------------------------------
    // Constructor
    //----------------------------------------------

    /**
     * Basic default constructor.
     *
     * @param sampleRate
     */
    public BandPassFilterInst(int sampleRate) {
        this(sampleRate, 2500, 1);
    }

    /**
     * Constructor that sets sample rate and the number of channels
     *
     * @param sampleRate   The number of samples per second (quality)
     * @param filterCutoff The frequency above which overtones are cut
     */
    public BandPassFilterInst(int sampleRate, int filterCutoff) {
        this(sampleRate, filterCutoff, 1);
    }

    /**
     * Constructor that sets sample rate and the number of channels
     *
     * @param sampleRate   The number of samples per second (quality)
     * @param filterCutoff The frequency above which overtones are cut
     * @param channels     1 for Mono or 2 for Stereo
     */
    public BandPassFilterInst(int sampleRate, int filterCutoff, int channels) {
        this.sampleRate = sampleRate;
        this.filterCutoff = filterCutoff;
        this.channels = channels;
    }

    //----------------------------------------------
    // Methods
    //----------------------------------------------

    /**
     * Initialisation method used to build the objects that
     * this instrument will use and specify thier interconnections.
     */
    public void createChain() {
        Oscillator osc = new Oscillator(this, Oscillator.SAWTOOTH_WAVE, this.sampleRate, this.channels);
        Filter lpf = new Filter(osc, this.filterCutoff, Filter.LOW_PASS);
        Filter hpf = new Filter(lpf, this.filterCutoff, Filter.HIGH_PASS);
        Volume vol = new Volume(hpf);
        Envelope env = new Envelope(vol,
                new double[]{0.0, 0.0, 0.05, 1.0, 0.2, 0.4, 0.8, 0.3, 1.0, 0.0});
        StereoPan span = new StereoPan(env);
        SampleOut sout = new SampleOut(span);
    }
}


